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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa95fd7379d9b88e988d274c952806c2df31e2632abb40bd29685f081062ddb5' 
  AND token = 'j4dkk2Fv82Vc5qtOyggP2YRkZLusZQMSs+4zw3qZS18=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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