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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b901b5c44b0e826868bdac2104a904f0c89e83358f7b6dd5bc243f88d91012a' 
  AND token = 'eu5njqmN0ss3WfeUuNG3XBOpJBTEXtuDkf/7adHZo8A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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