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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4fbf236909bb391f6627275c15445fecfe77320b4cbe3aa3af9123a2db579f7e' 
  AND token = 'plvgOP0/tbLdFlLwxF3ityfmwE8PmAezkDghDGTGlGQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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