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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9bda0e56edf807268c4473b485144e5d4159bda1b1a8c2247429f5ab51c9573b' 
  AND token = '7ZguHQoQFUeNbm1MrKSj1Jy74EGQ6kYO+HD/cMlERh0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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