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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c461457b4905b38721c843965e3479d8d6971fe88fe5c0d69e9a4eb954b31b3a' 
  AND token = '4za52l3BL9meg1q9gTR032pDMGpNiC0cQcmldrgfxVA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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