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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b98b1f689f4217d0d7e563f379360f90b071090861ccfa0923e7cc2cf337d0b6' 
  AND token = 'mczZzQO90wiccHa1HjYIas5q3mb2E5QnYqF+jQAjDl8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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