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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0a6e99734978a0cf2c294ced703e7d0ada4d3177a9b4b4eb8b17de625f7bbc4' 
  AND token = 'WyTzBIw8Iv2uiAK1wuU+hUPs114vd0MSkv6eAz0vk04=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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