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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '939445c01e5d21075945150fe4b96f85e7b593223dbd9a5e83b8bc35e871795a' 
  AND token = 'G0UrBSutb3pqRtidKMSz4ype4ksxgIcRGD7xg4EBEIw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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