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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d7ada186326c9a6bfb0da834b93bcfdf9d36055ed3944304c9873d52ede4fd4' 
  AND token = '6BgZ3+vh1bYNA9ygGHt7C/lxh1gIMINeoGPOToNggTY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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