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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6afede090b4ee03f8d9549d17a9c5b58e06b2762a968b4491999edccf9288aaa' 
  AND token = 'CE/ATqdbqNmzT8ieNVjgyBasiz8g4j8LjYJdxudE4iY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00098

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}