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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8cfb313c1942caca240705aa5c020a972ebe04c3fad281ff7fecbc7efc0fde42' 
  AND token = 'Nij8/P3se1M05Q4koY7Ih34ukPNK/HBriQSMG7HDK70=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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