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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '085ee066f3f2f8d42b3bf6d6fe5f3b7348193219932195ebfbd15462a52a6f96' 
  AND token = 'rByyzmGl2bVNr91FZq7eVrpVxBDgao6v23Gya1PIQwc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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