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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c50437da5bedca331718d8af435ac24615ae1bc061d8faee15b494c2edae8d46' 
  AND token = 'VeplQJSBmTXYe9vaO3sEaucyrEQ6RlhvhvWWLTaKb54=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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