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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad32f3084d7eb08e857b4031cabc1c0340540b3af1cf2186157fba028a908d0b' 
  AND token = 'Bbqo3DW7yMLotXenX0jXra7/EbpdiN3paDMYQH4WvH0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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