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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30436b76e979e00bfb8aff307ea582f1bf8c4eb0ef8c1d7626b6436a83147df0' 
  AND token = 'Dov/DNHjhbBXmtkfWZsx9pEa9i9lwslQ3KUAOhDsQiE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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