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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3e592ef3bd7531df1ed461061df1b8f8d77f0075f0249cd099cd496924c1c27' 
  AND token = 'kB9fHYSfnqtRhoUoZVsbJ/z0sMBzPOflyEtLroED0lA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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