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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1414fb1cf59fc72598276b49e49bca5a1dc7cd0e9c1e238106ca858e61a16a4' 
  AND token = 'nC2M1h1ND3y3SHxvvrVVIKshPhgcOkHkvP1YajaNvKs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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