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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71745bf23ab54fb20f44a054743bdaf890c27f077d33f6fde64038e7d09e6d15' 
  AND token = 'czKOobRJ+vpeymVuiR1Mih0yt+MgUEhTYiC2gX89q+c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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