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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '875c91bdeb3d37f7e18b202feb43239bb92e49446882c3a0ad1e28a64f809e37' 
  AND token = 'MF114ohi3RWNd3Drqh2pOZ9AIg6AhFFTlplyKIOo4l0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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