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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd501b9ed5687e1c07857e99d426c01faf5202d10eed44330486c030540d30607' 
  AND token = 'N+CQf5F6+mlhiLVka67v+tUFYE78xm879Hij4LDU4h4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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