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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8fe2b3ac920870a7ddbc1a1673e8e38c876bd7a82c8980736c3060119733418b' 
  AND token = '4Ww67m1Pcumd5sAFzwnMQXh3PS+q5naJ2MwodDiSRCM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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