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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea2d50f10b9bfe960b73991de9ede8edc30d8b2d98005586ee39cda3b0f720bd' 
  AND token = '0yBvRV7bflUDtGxnteVWOZ7FFhXLGhcurexLMB+/RFU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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