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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0bc2738b838b883fe0b2b35a9e23e0e2a03a011e64b158c1ed707fd0cd922592' 
  AND token = 'P5eIaAKbbMdcE1N1lKGg5WKdXMorcB9pFnjDdkEQvYs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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