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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29420de51b716ac1d50cbcf4ca43f0a91f1222b2a57973fd33eaae409bf2062f' 
  AND token = 'YAlHKlbOXhq13iy2+T+l9FmpBRk3yiGtXsf9mj4PMMY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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