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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '362ed7a57cdaae0f97496b146d173b4b51f82bdb0143abff4f3be345b4397dd3' 
  AND token = 'YfsNZ+oYjm25QOXMM0VpVRaf6VFVenUu2M5+YW/yIxA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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