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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a5c349eeaa33a4768026409085f97a4320373b55f00950df6938b4bf5bd4308' 
  AND token = 'le6TxVV9h7vGs1rI/es99MQ+eQOh7CCODYGekxYtuOs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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