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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a05636849a79cebc479d87b356abaccb68e88c1d5a82c1048c1a79e8eadb08c8' 
  AND token = '9VHht38nW8GsY5eHtOFlzEC1lEfSPA9/v0VCveuAaAk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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