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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98ce66cc36c5c4c531ab7a4fd7f6760e09cf8d390f0a465c3a9d5b6e285cd7ee' 
  AND token = 'QBnf/EWmJHDxqMG+BwkNfLmZe1LWiTTfcR9Adh0q658=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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