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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5b68e5637a84a2bbe58598c921e6c4aaaf56ff0a643ca282b2451d7bd36dc76' 
  AND token = 'R6hFg58BeWgjqYL2lmQiHQlesR4IZZW1sUqnfh3j3oE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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