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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '970ae927742013a860cb3c516511c6574228a600c58731329e93b56e5d672df7' 
  AND token = 'W6guIfPrt9b3spwGs0QH+leyMdw+yxxZjWYYM9JfCLg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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