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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4359ba5a324bbb5e86d28be7ce65e5ac612417069b93ed20507c82ff3b0acaa9' 
  AND token = 'fBZF078MFvM5mRvAVkZQYxOpoRa7JLIMKjGw8YtMKM8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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