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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cde10a3da017d94465d27aa0480d7e0c42c0ceddfa5a4065f4ed10664556afeb' 
  AND token = 'yfKVIDHVx53AvbQex3tYZof3meDobQVeamohYc+ccQQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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