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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da1096039811013779ed36d9023786cb6b58723ccf75927483701372b11f0abb' 
  AND token = 'SjrdZ9BeZYJ9E7gqp7NjPZhVuqfG2WtOEq0wSN1n2oM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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