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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '021a41565d4168902e3b4dd25bf66224d89aed37b1f8511b7b56630c6e952c3e' 
  AND token = 'JFbIYBTQmmuSqVViIMYzEguk4s2ou5P0lE229BhiP7U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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