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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07b0f178a1f909cde8d33c4a8c942228261e18372295eea099df82cc75db3616' 
  AND token = 'hD6vr1EFhtEeAO84ZBOvq6r2XBY9s91H17T7u7kwOFM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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