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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71741d9f26be11f8d0fe7134460457551a59a9fa7fba1e8603359df1befe0645' 
  AND token = 'H3KpNca0M6BlbPczDI2h71+zaOBZd1vxaL6DeKWaLAE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00063

JSON explain

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