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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d762a73489707954a48960827f71499cf1de937da84394992565953db22c6f8' 
  AND token = 'BjJUVxgtrCHsSBg7Su/ec2jfEulBlGQlYmgmdLeEY3E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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