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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2fea0d161e11ace8ec187ac880df5de319a70133a35c4b485a26790824ac2e49' 
  AND token = '72KcblC8uMIjLKp4a5RcJMSg97LK7RRPQOJaPABx218=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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