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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d368d629712a530d80935b5ae385595300b29c14220e703521b12f2675358b1' 
  AND token = 'n2r3A28bLaQ3fpCYleYqaUeXogh/ABOrT/G0i740qkc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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