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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'abfadf95ae348a1fd3ef9ba819adedc22a4c66acccab8ee357b88557ffef7e9e' 
  AND token = 'o5cTfj6/v9tMu4Pb0XwkM0W/5hSbc+bIx49kUBA96sk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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