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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28ac4c0e3b2e86a97720b26471a71bb51e3f2b74d69f86d2e5985dddcfe6b344' 
  AND token = 'Pfux5wv8uD5qWZXtwemkPXSgZy1aEbISXpi7AehtrgY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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