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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b02cd760f48921a237a6d3d039bad30b8cec158fb2f426368549a4f53c599de9' 
  AND token = '0IBX7sJKrcCUdSGLDli3RQjTY6rWAxdRze4cn3XIpdM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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