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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f971205a4c65149062a350bf4e8d8732c3d598e73ccf1d37927ab030429cc93' 
  AND token = 'KbHrC0ZkLfDHUQizgpba55Yds82JNE01idQSC6fSLQM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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