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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbf4ef0aa686a54ad7391de8fe74d763eec997b330ee242a2ea4fc5f54d4aee6' 
  AND token = 'a/U7arswTqeM9jVcIof7umzteG3rjj82LTTt744R0QU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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