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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9aa2091a33174fa7e9cbb7640cdf9f1ae2ccf226383fc2dbc30fa5b0f68c5cb7' 
  AND token = 'kwuBhaKtZkHB67TZdDasAP4ng5kOvguUcS8QTtqETFA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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