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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8063964025f5e5860518c7990d01a95e98603ec31efa810cc8f55d6e5e3b634f' 
  AND token = 'omRJdRdM8uH0W4vTnc2Qs799juGxlELLbJAqqwRm6cc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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