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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11f30f33e53a7ae8c15a099373179509a40d6ffe6a9f46c06d0e83e441407436' 
  AND token = 'UM/zZ4KJFET2wPsN5ZzL4MrXmqojmEygn7sZCr6NKkU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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