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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6d3ab82fef51d30a83d378be0112b4ba8aac9bb1b83c0c658dc0722e5b40cf6' 
  AND token = 'aAWBlpNFNyBZxgFG0X9Lq0gAXd2EA3ftoM0mIDEjvQY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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