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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd39de605f4ca92a2eb6c4a1dfdbd2f8fce36349e2401112df6fb6e33e6e03bb' 
  AND token = '43Epu44RQ/qqBCa08rTHjk4Ai/3gnAJXcVSC31SZRPA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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