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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9040eeebcacdd7ec5bb2e7fa7c5febfe83ef435a08670a01ce65c71a8c6b542' 
  AND token = '49H3+y/gtm87g/sjG10T2IG6Rg8v5NGSobbVQ6ge8rw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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