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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '093c3e775e99fa992fe7e0a44283c5287273f9c31e81099378762f95cc750d5e' 
  AND token = 'Mo4Vhas+FJCtZq3ib+WaD5QciBocT7/5o5dezsRZ54o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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