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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3fc66834efd952a0c96105192e621cec2bc4a16c882e3b708bc47b24fe1dda25' 
  AND token = 'HlBabTMGo1V7q54zmGVCu2bazd4NM4dk55K5sBj/65c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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