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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4ea403d33e945592d6fca79c9183822bff9543f8401a99ef96834274c1bfced' 
  AND token = '717O/OgYhec6UMdpH5oukzc+w03S3zP7pOTNSE5j50U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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