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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63cba4fb96275be1c4e67bbd5ef8102b2c68bcbbf2167a80110085b77cd3124f' 
  AND token = 'zHOYaxmvsIizsX1TkpRxbhd21udLUQO/CIeGK8lG27o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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