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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6632b328dcaefd89cbf9b024405fa64a85994aa2ad5a84641e1f99cefa3cc617' 
  AND token = 'FvQJJLBrhv++Gy/rWXo0+WeeFi0uIPeee59nBowLP6M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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