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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '75a084765e079081f5ac67f7155c1897b72b7c881acd1bacc79500e3a7c6b016' 
  AND token = 'alamlL+6PQ+/WbsAHNq3uywnwCkGBFF5mpT356BmoSc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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