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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c212ef93747404733c593b820f227e65ebdd867f9c03ef50e030651ee814fd0' 
  AND token = 'lHjUZENZNuMQEO8WHybvkW3uKfAU9M/6N4t/9bgIOx8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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