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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df6a700cd7045f2cdd5dcbd6a09f2947a4e522231b37d55dce13b0e4f477a3e1' 
  AND token = 'aT0GbKyADVlkNBGEaECGWAujuAKoOCpJySmhBqEjogs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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